Zelda 3 Super Nes : Swamp Palace, 2nd cristal (gba, Snes mini, super nintendo)
save

Swim to the left and kill all the bad guys. Open the trunk and take the door. Make a hole on the left and take the map of the palace. Get out, lift the skull from the bottom (1) and take the key to open the bottom door. Cross, take the stairs and the door in front. Lift the skull to find the key. Get out, take the door at the top of the stairs. Tap the heads with the hammer and push the lever to the left (2). Get out, fall in the water and take the staircase then the door on the left. In the big room, take first the bottom door. Go around on the right to push the stone and get the compass (3).

Come back to the central room and take the door in lower left. Cross, take the stairs and take the door of face. Lift the skull to get a key (1). return in the central room and take the door at the top. Hit the sphere (2) and push the lever. Re-hit the sphere, take back the door from below (passing by central room) and take the door on the left. Go down the stairs, push the bottom block to the left and the middle one to the top (3). Take the door up.

Cross the room, push the block at the top right and fall into the hole (1). If you have typed the sphere you can go right and take the big key. Come back to the central room and open the big chest. You get the grapple. Use it on the right (2) and lift the skulls to get a little key. Come back to the top of the chest and use your grapple to the top (3).

Take the door, go to the left and lift the skull from the top. Push the statue on the button (1) and go take the door to right (not the stairs). Take the stairs and push the lever. Go down the small staircase and take the left door. Take the top door then take the hidden door under the 2 nd waterfall as you leave from the right (2). Climb the stairs and take the bottom door. Swim to the right and take the key under the skull (3). Swim to the left and open the door. It's the boss.

To kill him, use the grappling hook to catch the critters and kill them one by one with the sword. The giant jellyfish gets upset and flies away. Charge your sword and wait for it. Be careful, she will try to hit you. Avoid it and let go your charge to defeat her.

You can now continue the adventure by going in search of other crystals you now know the location. Here is a save for the ZSNES emulator (to copy and paste in the Rom file).